Magnetic Separator
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A magnetic separator is a magnetic separation device or magnetic assembly used to remove ferrous contamination, weak magnetic particles and tramp metal from powder, granules, liquids, slurries and bulk materials. It is widely used in food processing, pharmaceuticals, plastics, chemicals, ceramics, mining, recycling and material handling systems.
Depending on the application, magnetic separators can be built as magnetic bars, magnetic grids, drawer magnets, plate magnets, chute magnets, pipeline separators, rotary separators, drum separators and custom magnetic separation modules. The right structure depends on material flow, contamination size, cleaning method, temperature, hygiene requirement and target magnetic strength.
Ningbo Vanguard Technologies supplies custom magnetic separators using NdFeB, ferrite and SmCo magnets with stainless steel housings, welded tubes, sanitary polishing, food-grade seals, easy-clean designs and high-temperature options. We support magnetic circuit design, stainless fabrication, welding, polishing, assembly, gauss testing and batch inspection.
Whether you need a standard magnetic bar or a complete custom magnetic separator for an existing production line, Vanguard can provide engineering review and sample production within 10-25 days after drawing, material flow, working temperature and surface gauss requirement are confirmed.
The following separator structures are commonly used in production lines. Final size, magnetic strength and cleaning method are confirmed according to material flow, installation space and contamination control target.
| Separator Type | Typical Magnet | Surface Gauss | Housing Material | Key Feature | Typical Application |
|---|---|---|---|---|---|
| Magnetic Bar | NdFeB / ferrite / SmCo | 3,000-14,000G | SS304 / SS316L tube | Simple installation and flexible custom length | Hoppers, drawers, powder lines |
| Magnetic Grid | NdFeB bar array | 8,000-14,000G | SS304 / SS316L frame | Multi-bar coverage for free-flowing powders | Food, plastics, chemicals |
| Drawer Magnet | NdFeB grid set | 8,000-14,000G | Stainless drawer housing | Easy-clean pull-out structure | Powder and granule processing |
| Plate Magnet | Ferrite / NdFeB | 2,000-8,000G | Stainless or mild steel plate | Large contact area and low flow resistance | Chutes, conveyors, bulk materials |
| Pipeline Separator | NdFeB / SmCo | 8,000-14,000G | SS304 / SS316L sanitary housing | Installed directly into gravity or pneumatic lines | Food, pharmaceutical, chemical powder |
| Rotary Separator | NdFeB bar rotor | 8,000-12,000G | Stainless housing and rotating grid | Prevents bridging and improves contact | Sticky or poor-flowing powders |
| Drum Separator | Ferrite / NdFeB arc magnets | Custom | Stainless drum shell | Continuous separation for bulk materials | Recycling, minerals, aggregates |
Vanguard can customize magnetic separators from simple magnetic bars to complete stainless separator modules. The table below summarizes common specification items for engineering review.
| Item | Available Options | Engineering Notes |
|---|---|---|
| Magnet Material | NdFeB, ferrite, SmCo, high-temperature magnet system | Selected according to target gauss, temperature, cost and contamination particle size. |
| Surface Gauss | 3,000G, 8,000G, 10,000G, 12,000G, 14,000G or custom | Gauss is measured on the working surface and depends on magnet circuit and tube thickness. |
| Stainless Material | SS304, SS316, SS316L, sanitary polished stainless steel | Food, pharmaceutical and chemical applications may require SS316L and high-polish finish. |
| Structure | Bar, grid, drawer, plate, chute, pipeline, rotary, drum, custom module | Structure is selected by material flow, cleaning access, installation space and pressure condition. |
| Surface Finish | Brushed, mirror polished, sanitary polish, weld passivation | Surface finish affects hygiene, cleaning, corrosion resistance and material adhesion. |
| Temperature | Standard, high-temperature NdFeB, SmCo, ferrite system | Operating temperature should include product temperature, cleaning temperature and environment. |
| Inspection | Dimension, welding, surface finish, gauss mapping, leak check, packaging | Inspection can be customized for food safety, quality audits and process validation. |
| Factor | Influence on Performance | Recommended Check |
|---|---|---|
| Particle Size | Fine iron particles require stronger magnetic field and closer contact. | Define contamination size and target capture level before selecting gauss. |
| Flow Rate | High flow speed reduces contact time and may lower capture efficiency. | Confirm throughput, bulk density and flow behavior. |
| Material Thickness | Deep material layers may keep particles away from the magnetic surface. | Use grids, multiple rows or rotary design for better exposure. |
| Temperature | High product or cleaning temperature can reduce magnet output. | Select high-temperature NdFeB, ferrite or SmCo when required. |
| Cleaning Frequency | Captured iron buildup reduces available magnetic surface. | Define manual, easy-clean or automatic cleaning method by process risk. |
Vanguard can customize separator type, bar diameter, bar length, grid spacing, drawer size, flange connection, sanitary interface, stainless grade, surface finish, gauss level, cleaning structure and packaging. For existing production lines, we can design separators according to installation space and material flow direction.
Assembly support: We provide magnetic circuit design, stainless tube welding, end sealing, frame fabrication, polishing, passivation, magnet assembly, gauss testing and protective packaging.
Engineering review: If the project involves food contact, high temperature, pressure, corrosive media or poor-flowing powders, our engineering team can review material, surface finish and cleaning method before sampling.
Production begins with process review, separator structure selection and magnetic circuit design. Stainless tubes, plates, frames and housings are machined, welded and polished, then magnet systems are assembled and sealed according to the approved drawing.
Finished separators are checked for dimension, surface finish, welding quality, gauss level and appearance. Food or pharmaceutical projects can include additional polishing, passivation, cleaning and documentation before shipment.
Magnetic inspection: Surface gauss, gauss mapping, polarity, magnetic circuit consistency and working-face strength can be checked by requirement.
Dimensional control: Bar diameter, length, grid spacing, flange size, drawer fit, weld position and installation interface are inspected per drawing.
Surface verification: Stainless grade, polish level, passivation, weld quality, sealing condition and appearance can be checked for sanitary projects.
Documentation: Material certificate, inspection report, gauss report, RoHS/REACH declaration and lot traceability records are available.
To speed up engineering review, please provide a drawing or confirm the specifications below. If your separator will be installed into an existing line, photos or interface dimensions are also helpful.
